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Botany 1,030
Natural history 900
Plants 691
Birds 575
Zoology 491
Periodicals 423
Mollusks 263
Biology 254
Insects 235
Fruit Catalogs 230
Flowers Seeds Catalogs 220
Vegetables Seeds Catalogs 207
Plants, Ornamental Catalogs 204
Fishes 200
Science 186
Paleontology 178
Entomology 175
Pictorial works 171
Trees Seedlings Catalogs 146
Flowers Catalogs 142
Fruit trees Seedlings Catalogs 142
Shrubs Catalogs 124
Ornithology 119
Lepidoptera 117
Scientific expeditions 104
Agriculture 103
Bulbs (Plants) Catalogs 91
Nurseries (Horticulture) Pennsylvania Pittsburgh Catalogs 87
Mammals 85
Flowers Seeds Pennsylvania Pittsburgh Catalogs 84
Nursery stock Pennsylvania Pittsburgh Catalogs 84
Ethnology 78
Fruit trees Catalogs 78
Correspondence 77
Bulbs (Plants) Pennsylvania Pittsburgh Catalogs 75
Pteridophyta 75
1809-1884 73
Animals 73
Engelmann, George, 73
Letters 70
Nurseries (Horticulture) Catalogs 69
Beetles 68
Reptiles 68
Nurseries (Horticulture) 66
Fish habitat improvement 65
Wildlife habitat improvement 65
Ecology -- United States 64
Gardening 64
Invertebrates 64
Trees Catalogs 64
Forests and forestry 63
Flowers 60
Animal behavior 59
Crustacea 59
Geology 59
Malayan languages 59
Butterflies 58
Classification 58
Early works to 1800 58
Natural history -- Great Basin 58
Mollusks, Fossil 54
Gardening Equipment and supplies Catalogs 53
Amphibians 51
Antarctica 50
Botany, Medical 49
Ichthyology 48
Moths 47
Nursery stock 47
Plants, Ornamental, Catalogs 46
Poultry 46
Seeds 46
Nursery stock New York (State) New York Catalogs 44
Botanical specimens 43
Pre-Linnean works 43
Shells 43
Brewster, William, 1851-1919 42
Flowers, Seeds, Catalogs 42
Grasses Seeds Catalogs 42
Mammalogy 42
Mammologists 42
Plants, Cultivated 42
British Museum (Natural History) 41
Pulmonata 40
genealogy 40
Trees 39
Microscopy 38
Vegetables Seeds Pennsylvania Pittsburgh Catalogs 36
Ferns 35
Field Naturalists' Club of Victoria 35
Fruit-culture 35
Agriculture -- France 34
Horses 33
botany 33
Bacteriology 32
Fruit trees 32
Indians of North America 32
Vegetables, Seeds, Catalogs 32
Agricultural implements Catalogs 31
Bees 31
Brewster, William, 1851-1919 -- Diaries. 30
Fungi 30
Nursery stock Massachusetts Catalogs 30
Ornithology. 30
Copper engraving 29
Fisheries 29
Great Britain 29
Invertebrates, Fossil 29
Birds -- Periodicals 28
Strawberries Catalogs 28
Fruit trees, Catalogs 27
Gardening Pennsylvania Pittsburgh Equipment and supplies Catalogs 27
Graphic media : 27
Identification 27
Liliaceae 26
Oceanography 26
Plant breeding 26
Anatomy, Comparative 25
Historical geology 25
Hunting 25
Plants -- Great Britain 25
Uncolored 25
Voyages around the world 25
Arachnida 24
Fruit Seedlings Catalogs 24
Hemiptera 24
Microscopy -- Technique 24
Myriapoda 24
Seeds Catalogs 24
Berries 23
Catalogs and collections 23
Herpetology 23
Hymenoptera 23
Nurseries (Horticulture), Catalogs 23
Seed industry and trade 23
Worms 23
Botanists 22
Description and travel 22
Embryology 22
Evolution 22
Fruit 22
Materia medica, Vegetable 22
Medicinal plants 22
Natural history museums 22
Diptera 21
Fruit Seeds Catalogs 21
Game and game-birds 21
Nature 21
Asparagus Catalogs 20
Bulbs (Plants) 20
Catalogs 20
Grain 20
Plants -- France 20
Vegetables 20
Bering Sea controversy 19
Fishing 19
Freshwater animals 19
Gastropoda 19
Nut trees 19
Snakes 19
Tobacco 19
United States 19
Urban parks 19
Algae 18
Amaryllis 18
Burbank, Luther Company 18
Fruit, Catalogs 18
Grasses 18
Indians of South America 18
Insect pests 18
Marine animals 18
Mites 18
Nursery stock Kansas Lawrence Catalogs 18
Ornamental trees Catalogs 18
Pacific railroads 18
Biology -- Periodicals 17
Cactaceae 17
Homoptera 17
Nursery stock Catalogs 17
Nursery stock New Jersey Rutherford Catalogs 17
Ornamental shrubs, Catalogs 17
Public works 17
Sealing 17
Soils 17
British Museum (Natural History). Dept. of Zoology 16
Collection and preservation 16
Freshwater animals -- Germany 16
Gardening Pennsylvania Pittsburgh Equipment and 16
Mammals, Fossil 16
Nursery stock New York (State) Catalogs 16
Nut trees Catalogs 16
Veterinary medicine 16
Cereal grasses Catalogs 15
Dogs 15
England 15
Marine biology 15
Plants, Ornamental 15
United States Dept. of Agriculture 15
Anthropology 14
Cnidaria 14
Fungi -- France 14
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